DEP has a very faint, clean, and slightly sweet character that is imperceptible in finished compositions. It does not contribute meaningfully to the aromatic profile of a blend; rather, it functions as an invisible structural support. It is prized for its excellent solvency, low volatility, and ability to smooth and unify fragrance materials, particularly in alcohol-based applications.

DEP is used primarily as a fixative, diluent, and solvent in fragrance and cosmetic formulation.
Recommended usage:

Diluent and fixative in fine fragrance and eau de parfum/toilette formulations

Extends the longevity and tenacity of top and heart notes in alcohol-based perfumes

Improves the solubility of difficult or poorly miscible aromatic materials

Carrier for fragrance compounds in body sprays, splash colognes, and cosmetic preparations

Useful for pre-diluting viscous or potent aroma chemicals for accurate weighing and blending

DEP slows the evaporation of volatile top notes, helping to balance the development of a fragrance on skin over time.

Material Type: Solvent / fixativeChemical NameDiethyl Phthalate
CAS Number: 84-66-2
Origin: Synthetic
Odour Profile: Virtually odourless; very faint, clean sweetness
Appearance: Clear, colourless liquid
Solubility: Miscible with alcohol; soluble in most organic solvents
Key Components: Diethyl Phthalate

Flammable. Keep away from heat, sparks, and open flames
For external use only. Do not ingest
Avoid prolonged or repeated skin contact; use gloves where extended handling is required
Use in a well-ventilated area
Check current regulatory guidelines before use. DEP is subject to restrictions or review in certain cosmetic and leave-on applications in some jurisdictions (EU, California)
Store tightly sealed in a cool, dark place away from direct sunlight
Shelf life: 2–3 years when stored correctly